Amp Shutting Down, need help


I have a Cary 7.250 brand new amp that shuts down after 20 seconds in my NYC apartment. I have sent the unit back to Cary where it tests fine. I have tried the unit at my friend’s apartment and his place of work and it works fine. The unit is 100% in working order. After talking to many people I was told to attach a 50' extension cord and low and behold it worked.

The good news is that I have a dedicated 20amp circuit to this outlet. My voltage reads 118 volts and Cary said that is not a problem as the unit will work between 90 and 130 volts. I have tested for voltage on the negative lead to ground and there is no stray voltage. I have also tried the unit on other outlets in the apartment and the same problem occurs.

My mono blocks and all other components work just fine. So I’d love to hear suggestions as to how to get rid of this 50’ extension cord?

Thanks in advance.
sailcappy
If it were me, by now I would be either trying to get my money back or llooking to sell the amp. Before owning my own house, I lived in an apartment with a single 15A circuit serving the entire place. It does not get worse case than that. I owned several high powered amps during that period and never once experienced a shutdown problem. Cary gave the amp a clean bill of health, therefore it should not be having the issue. The amp seems like more trouble than it's worth, IMHO.
I agree. They will not give me my money back. They are willing to send me a new one. Do you think it is worth a try?
I agree. They will not give me my money back. They are willing to send me a new one. Do you think it is worth a try?
09-04-12: Sailcappy

Through the dealer you bought the amp from?

If so, yes..... But have the dealer sell the new amp on consignment.

From everything you have told us in this tread,

*You sent the amp back to Cary. They said nothing was wrong with the amp. Checked out fine.....

*You had them send you a new 15 amp magnetic breaker. That breaker trips.

*The amp works fine at your friends house.

I can't believe you have moved the amp around as much as you have..... The specs says it weighs 105 lbs....

What makes you think the new amp will work in your apartment?

The only way I would try the same amp in your apartment is if Cary replaces the 15 amp magnetic breaker with an on/off main power switch and adds a fuse for overcurrent and short circuit protection. Get rid of that magnetic breaker.....

It maybe time to cut your losses and move on.

Take the new factory fresh sealed box amp and have the dealer sell it to recoup most of your money.
To be honest the dealer shouldn't charge you a dime to sell the amp for all the problems you have gone through with the amp.

When the dealer sells the new amp he refunds you your original purchase price less the sales tax.

Beat the hell out of selling it as used all over again if the thing does not work in your apartment. And who wants to buy a used amp that is so finicky it may not work in the buyer's home? I wouldn't touch the thing with a 10' pole.....

Life is too short!
When i get the Oscilloscopes what should I be looking for? Is there a setting I should use?

I am betting that once we find the real problem with my ececticity a real solution could be found.
When i get the Oscilloscopes what should I be looking for? Is there a setting I should use?
I described one of the things that should be done in my post dated 8-18-12. Also, you should look for any major distortion of the 60 Hz waveform. Ideally it should look like a close approximation of a 60 Hz sine wave. If you see anything questionable try to photograph it, and post the photo at one of the free online photo-sharing services, with a link to it here.

As far as settings are concerned, there are a great many of them, so try to have Ken guide you through this. Also, of course, be cautious of the fact that you will be connecting to a potentially lethal voltage.

Sorry that the Brick Wall didn't help. Before selling it, it may be worth your while to compare sonic results between it and the SR, powering the entire system from one and then the other.

Regards,
-- Al